PHP provides a simple method to generate a specified random string

This article mainly introduces the simple implementation of PHP to generate a specified random string. it involves php's skills in operating arrays and strings and has some reference value, for more information about how to generate a specified random string in PHP, see the following example. Share it with you for your reference. The specific analysis is as follows:

This is a simple function that does not forcibly set the generated content. Therefore, when the length of the generated string is small, there will be no specified type of characters. Of course, the modification is also very simple, so we will not add it here.

/*** @ Param string $ type * @ param $ length * @ return string */function randomString ($ type = "number, upper, lower", $ length) {$ valid_type = array ('number', 'uppper ', 'lower'); $ case = explode (",", $ type ); $ count = count ($ case); // determines whether the parameter is valid based on the intersection. if ($ count! = Count (array_intersect ($ case, $ valid_type) {return false;} $ lower = "abcdefghijklmnopqrstuvwxyz"; $ upper = strtoupper ($ lower ); $ number = "0123456789"; $ str_list = ""; for ($ I = 0; $ I <$ count; ++ $ I) {$ str_list. = $ case [$ I];} return substr (str_shuffle ($ str_list), 0, $ length);} echo randomString ("number, upper, lower", 12 );

I hope this article will help you with php programming.